KR102262754B1 - Low temperature liquefied gas vaporizer, cooling system, and ice accretion suppressing method in vaporizer - Google Patents

Abstract

Even when water does not flow in the vicinity of the outer surface of the heat transfer tube, freezing of water can be suppressed.
The vaporizer 10 has an inner space IS, is disposed in the shell 12 into which water is introduced into the inner space IS, and is disposed in the inner space IS, into which liquefied natural gas is introduced, and is liquefied by water. A heat transfer tube 14 for heating natural gas and a heat transfer suppressing member 30 made of a material having a lower thermal conductivity than water are provided. The heat transfer suppression member 30 covers the heat transfer tube 14 in a part of the heat transfer tube including the introduction site of liquefied natural gas.

Description

Low TEMPERATURE LIQUEFIED GAS VAPORIZER, COOLING SYSTEM, AND ICE ACCRETION SUPPRESSING METHOD IN VAPORIZER

The present invention relates to a low-temperature liquefied gas vaporizer, a cooling system, and a method for suppressing icing in the vaporizer.

Conventionally, as disclosed by the following patent document 1, the vaporizer of low-temperature liquefied gas is known. In the vaporizer disclosed in Patent Document 1, a shell into which water, which is a fluid to be cooled, is introduced, a heat transfer tube disposed in the shell and into which a low-temperature liquefied gas, which is a low-temperature fluid, flows in, a side wall provided in the shell parallel to the heat transfer tube, a heat transfer tube and a side wall A flow rate adjusting unit for reducing the flow rate of water flowing between the . In this vaporizer, the flow rate adjustment part is provided, and sufficient flow velocity is ensured between heat transfer tubes. Thereby, problems, such as icing resulting from the fall of a flow velocity, are prevented.

Japanese Patent No. 4313605 Publication

Patent Document 1 describes that the flow of water between the heat transfer tubes is ensured by reducing the flow rate of water flowing between the heat transfer tubes and the side walls. However, in a place in contact with the outer surface of the heat transfer tube, since the flow of water may not be ensured in some cases, icing may occur.

Therefore, the present invention has been made in view of the above prior art, and an object thereof is to suppress freezing of water even when no water flow occurs in the vicinity of the outer surface of the heat transfer tube.

In order to achieve the above object, the present invention provides a shell having an inner space, into which water is introduced, and disposed in the inner space, into which a low-temperature liquefied gas is introduced, and the low-temperature liquefied gas is heated by the water. and a heat transfer suppressing member formed of a material having a lower thermal conductivity than water, wherein the heat transfer suppressing member covers the heat transfer tube in a portion of the heat transfer tube including the introduction site of the low-temperature liquefied gas. it is a vaporizer

In this invention, the site|part in which the low-temperature liquefied gas flows in a liquid state is covered with the heat transfer suppression member. That is, the site|part into which low-temperature liquefied gas is introduce|transduced into a heat exchanger tube is a site|part used as the lowest temperature in a heat exchanger tube. And this site|part is covered with the heat transfer suppression member formed with the material with a lower thermal conductivity than water. For this reason, since the cooling heat of the low-temperature liquefied gas in the heat transfer tube is transmitted to the water through the heat transfer tube and the heat transfer suppressing member, heat transfer to the water can be suppressed compared to the case where the cooling heat of the low-temperature liquefied gas is directly transmitted from the heat transfer tube to the water. Accordingly, even when water does not flow in the vicinity of the outer surface of the heat transfer tube, freezing of water around the heat transfer tube can be suppressed. In addition, if icing occurs in the absence of the heat transfer suppressing member, the icing will grow large in the thickness direction and the longitudinal direction, and icing blockage of the gap between the heat transfer tubes is likely to occur. In order to prevent this, it is necessary to raise the temperature of the water to be supplied. By providing the heat transfer suppression member, even if the temperature of the water to be supplied is set to be low, blockage due to icing can be suppressed.

The heat transfer suppression member may cover the heat transfer tube from the introduction portion of the low-temperature liquefied gas to a portion where the low-temperature liquefied gas is heated without a phase change or a portion where the low-temperature liquefied gas starts to evaporate. .

In a site where the low-temperature liquefied gas starts to evaporate, the low-temperature liquefied gas tends to absorb heat from the heat transfer tube. However, since this site|part is also covered with the heat transfer suppression member, it is suppressed that a heat transfer tube absorbs heat from surrounding water. Accordingly, even when water does not flow in the vicinity of the outer surface of the heat transfer tube, freezing of water around the heat transfer tube can be suppressed. In addition, by providing the heat transfer suppressing member in the portion where the low-temperature liquefied gas is heated without a phase change in a low-temperature state, it is suppressed that the low-temperature heat transfer tube absorbs heat from the surrounding water. Accordingly, even when water does not flow in the vicinity of the outer surface of the heat transfer tube, freezing of water around the heat transfer tube can be suppressed.

The heat transfer suppression member may be formed of a resin-based material, a glass-based material, a rubber-based material, or a ceramic-based material.

The heat transfer suppression member may be constituted by a C-shaped cross-section member, a pipe-like member, or two halved members.

When the heat transfer suppressing member is constituted by a C-shaped member in cross section, the heat transfer suppressing member can be attached to the heat transfer tube from the outside by opening the slit portion. Therefore, it can prevent that the installation operation|work of the heat transfer suppression member becomes cumbersome. Moreover, the installation operation at the time of installing a heat transfer suppression member to the heat transfer tube of the already installed carburetor is also not troublesome. In addition, when the heat transfer suppressing member is constituted by a pipe-like member, since a part of the heat transfer tube in the circumferential direction is not cut off, it is possible to prevent water from entering the inside of the heat transfer suppressing member. Moreover, even when a heat transfer suppression member is comprised by two halving members, it can prevent that the attachment operation|work of a heat transfer suppression member becomes cumbersome. Moreover, the installation operation at the time of installing a heat transfer suppression member to the heat transfer tube of the already installed carburetor is also not troublesome.

The heat transfer suppression member may be attached to and detachably from the heat transfer tube from the outside. In this aspect, even when it is necessary to replace|replace a heat transfer suppression member, it can cope with it easily.

The heat transfer suppression member may be constituted by a cross-sectional C-shaped member having a slit. In this case, the 2nd heat transfer suppression member which covers the said slit of the said heat transfer suppression member may be provided. In this aspect, penetration of water from the slit can be suppressed. In other words, it is possible to achieve both the ease of attaching the heat transfer suppressing member and the effect of preventing water intrusion.

The heat transfer suppression member may be constituted by a plurality of division members arranged in a direction in which the heat transfer tube extends. In this case, a second heat transfer suppressing member may be provided that is formed of a material having a lower thermal conductivity than water and covers between the dividing members. In this aspect, it can be set as the structure in which the heat transfer suppression member was attached to the heat transfer tube by arranging a plurality of division members in the direction in which the heat transfer tube extends. For this reason, even when a heat transfer tube is a very long structure, since it becomes unnecessary to prepare the heat transfer suppression member of a very long integral body, it can suppress that the attachment operation|work of a heat transfer suppression member becomes complicated. In addition, since the second heat transfer suppressing member covers between the dividing members, it is possible to suppress the penetration of water from between the dividing members.

The heat transfer suppression member may be constituted by a plurality of division members arranged in a direction in which the heat transfer tube extends. In this case, one end of the adjacent dividing member may cover the end of the other dividing member. In this aspect, since the ends of the dividing member do not come into contact with each other, it is possible to avoid intrusion of water from the gap between the ends. Moreover, even in the case where the heat transfer tube has a very long configuration, since it is not necessary to prepare an extremely long integral heat transfer suppressing member, it can be suppressed that the installation operation of the heat transfer suppressing member becomes complicated.

The heat transfer tube may have a plurality of straight tube portions and a plurality of bend portions, and may have a shape extending vertically while meandering. In this case, the low-temperature liquefied gas may be introduced into the lowermost straight pipe part among the plurality of straight pipe parts. Moreover, the said heat transfer suppression member may be attached to the straight pipe part located at the said lowermost side. In this aspect, since the lowermost straight pipe portion of the heat transfer tubes is the lowest temperature portion of the heat transfer tubes, the heat transfer suppressing member is provided in this portion, whereby freezing of water around the heat transfer tubes can be effectively suppressed.

At least one first bend portion and at least one second bend at a position retracted from the first bend portion in the extension and protrusion direction of the straight pipe portion than the first bend portion, in the plurality of bend portions arranged in the vertical direction among the plurality of bend portions A portion may be included, and the at least one first bend portion and the at least one second bend portion may be alternately arranged. In this case, the welding portion of the at least one first bent portion and the straight tube portion may protrude more than the welding portion of the at least one second bent portion and the straight tube portion in the extending projection direction of the straight tube portion.

In this aspect, it can suppress that the width|variety of the 2nd bend part side in the space adjacent to the welding part of a 1st bend part and a straight pipe part becomes narrow. Therefore, in the operation of welding the first bend portion to the straight tube portion or the inspection operation of the welding portion, it is possible to suppress the obstruction of the adjacent straight tube portion.

The low-temperature liquefied gas vaporizer may further include an adjacent heat transfer pipe which is disposed adjacent to the heat transfer tube in the inner space, and into which the low-temperature liquefied gas is introduced to heat the low-temperature liquefied gas with the water. In this case, the adjacent heat transfer tube may have a plurality of straight tube portions and a plurality of bend portions, and may have a shape extending vertically while meandering. In addition, in the plurality of bend portions arranged in the vertical direction among the plurality of bend portions in the adjacent heat transfer tube, at least one adjacent first bend portion adjacent to the at least one first bend portion, and the at least one At least one adjacent second bend portion adjacent to the second bend portion may be included, and the at least one adjacent first bend portion and the at least one adjacent second bend portion may be alternately arranged. In this case, the welding part of the at least one adjacent second bent part and the straight pipe part protrudes from the welding part of the at least one adjacent first bent part and the straight pipe part in the extending protrusion direction of the straight pipe part, and the at least one second bent part and the straight pipe part are welded together. 2 You may protrude from the said welding part of a bend part and a straight pipe part in the extension and protrusion direction of the said straight pipe part.

In this aspect, it can suppress that the width|variety of the adjacent 1st bend part side and the width|variety of the 2nd bend part side in the space adjacent to the welding part of an adjacent 2nd bend part and a straight pipe part become narrow. Therefore, in the operation|work of welding the 2nd bend part adjacent to a straight pipe part, and the inspection operation|work of the said weld part, it can suppress that the adjacent straight pipe part interferes.

The low-temperature liquefied gas vaporizer may include an inlet chamber into which the low-temperature liquefied gas flows, and an outlet chamber into which the gas vaporized from the low-temperature liquefied gas in the heat transfer tube flows. In this case, the heat transfer tube may be constituted by a straight pipe connecting the inlet chamber and the outlet chamber in a straight line. Moreover, the said heat transfer suppression member may cover the predetermined range from the said inlet chamber in the said heat transfer tube. In this aspect, the heat transfer suppression member covers the site|part on the inlet chamber side used as the lowest temperature among the heat transfer tubes. For this reason, freezing of water in the vicinity of a heat exchanger tube can be suppressed effectively.

The heat transfer tube may be constituted by a U-shaped tube. In this case, the said low-temperature liquefied gas may be introduce|transduced into the lower straight pipe part of a U-pipe. In addition, the said heat transfer suppression member may cover the lower straight pipe part among U-shaped tubes. In this aspect, since the lower straight tube portion of the heat transfer tubes is the lowest temperature portion of the heat transfer tubes, the heat transfer suppressing member is provided in this portion, whereby freezing of water around the heat transfer tubes can be effectively suppressed.

The low-temperature liquefied gas vaporizer includes an inlet chamber into which the low-temperature liquefied gas flows, an outlet chamber into which the gas vaporized from the low-temperature liquefied gas in the heat transfer tube flows, and an introduction port for introducing the water into the inner space of the shell. may be provided. In this case, the said introduction port may be arrange|positioned in the said shell at the position adjacent to the said inlet chamber.

In this aspect, since water with a large calorific value is introduced into the place at the lowest temperature in the low-temperature liquefied gas, freezing of water can be further suppressed.

This invention is a cooling system provided with the said vaporizer and the cooler into which the water cooled by the said low-temperature liquefied gas in the said vaporizer is introduce|transduced.

In this cooling system, water cooled by the low-temperature liquefied gas in the vaporizer is used in the cooler to cool the object to be cooled. Therefore, the cooling heat of a low-temperature liquefied gas can be utilized for cooling of a cooling object. In addition, by providing the heat transfer suppression member in the vaporizer, freezing of water is suppressed. For this reason, even if the temperature of the water introduced into the vaporizer is set to be lower, since blockage due to icing of the gap between the heat transfer tubes in the vaporizer is suppressed, it is possible to set the vaporizer so that the temperature of the water drawn out from the vaporizer becomes lower. . Therefore, the ability as a cooling system can be improved.

The present invention relates to a vaporizer having an inner space, a shell into which water is introduced into the inner space, and a heat transfer tube disposed in the inner space, into which a low-temperature liquefied gas is introduced, and heating the low-temperature liquefied gas with the water. a method for suppressing icing in a vaporizer, wherein a heat transfer suppressing member formed of a material having a lower thermal conductivity than water is provided on the outer surface of a part of the heat transfer tube including a site for introducing the low-temperature liquefied gas in the heat transfer tube A method of suppressing icing.

As described above, according to the present invention, even when water does not flow near the outer surface of the heat transfer tube, freezing of water can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the low-temperature liquefied gas vaporizer which concerns on 1st Embodiment.
2 : is a figure which shows the heat transfer tube and heat transfer suppression member provided in the said low-temperature liquefied gas vaporizer.
Fig. 3 is a diagram partially showing a cross-sectional C-shaped member constituting the heat transfer suppressing member.
Fig. 4 is a perspective view of the heat transfer suppressing member when the heat transfer suppressing member is constituted by a tubular member.
5 : is a figure of a heat transfer suppression member in the case where the heat transfer suppression member is comprised by two halves-shaped members.
6 : is a figure which shows the state when the 2nd heat transfer suppression member is provided.
7 : is a figure which shows the state in the case where the heat transfer suppression member is comprised by the some division member, and the 2nd heat transfer suppression member is provided.
Fig. 8 is a diagram showing a state when the heat transfer suppression member is constituted by a plurality of division members and is disposed in a state where the ends of the division members overlap each other.
9 : is a figure which shows the structure of the vaporizer in which the shell was provided with two introduction ports.
10 : is a figure which shows the structure of the low-temperature liquefied gas vaporizer in which the heat transfer tube was comprised by the U-shaped tube.
11 is a diagram showing the configuration of a low-temperature liquefied gas vaporizer in which a heating unit is provided in a shell.
12 is a view for explaining a case in which the heat transfer tube is constituted by a meandering tube.
13 is a view for explaining a low-temperature liquefied gas vaporizer having a heat transfer tube having a configuration in which first and second bend portions are alternately arranged.
14, (a) is a partial side view of a heat transfer tube group for demonstrating the positional relationship of the bend part of the some heat transfer tube provided in the low-temperature liquefied gas vaporizer. (b) is a partial plan view of a heat transfer tube group for explaining the positional relationship of the bends of a plurality of heat transfer tubes provided in a low-temperature liquefied gas vaporizer.
15 is a diagram schematically showing the overall configuration of the cooling system according to the second embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates in detail, referring drawings for the form for implementing this invention.

(First embodiment)

As shown in Fig. 1, a low-temperature liquefied gas vaporizer (hereinafter simply referred to as a vaporizer) 10 according to the first embodiment converts liquefied natural gas (LNG), which is a low-temperature liquefied gas, into water (seawater, industrial water, etc.) It is a vaporizer 10 for heating to vaporize. Since the low-temperature liquefied gas referred to herein is a product obtained by liquefying a gas that is in a gaseous state at room temperature at a low temperature, the vaporizer 10 is used to vaporize liquefied gases such as liquefied _{petroleum gas (LPG) and liquefied hydrogen (LH 2 ).} may be used.

The vaporizer 10 is constituted by a shell-and-tube type heat exchanger, and includes a shell 12 and a plurality of heat transfer tubes 14 arranged in the shell 12 . The shell 12 is formed in a hollow shape and an elongated shape extending in one direction. An inlet chamber 16 is connected to one end of the shell 12 in the longitudinal direction. Liquefied natural gas is introduced into the inlet chamber 16 from an external pipe (not shown) through an inlet port 16a. An outlet chamber 18 is connected to the other end of the shell 12 in the longitudinal direction. Natural gas NG vaporized from liquefied natural gas flows into the outlet chamber 18, and this natural gas is led out to an external pipe (not shown) through the outlet port 18a.

The shell 12 is provided with an inlet port 21 for water (heat source medium) and a water outgoing port 22 . Water is introduced into the inner space IS of the shell 12 from the outside through the introduction port 21 . Water in the inner space is led out to the outside through the lead-out port 22 . The water introduction port 21 may be arranged at a position adjacent to the inlet chamber 16 in the shell 12 , or may be arranged at a position adjacent to the outlet chamber 18 . The water lead-out port 22 may be arranged at a position adjacent to the outlet chamber 18 in the shell 12 , or may be arranged at a position adjacent to the inlet chamber 16 . In this embodiment, the introduction port 21 is arrange|positioned at the position adjacent to the entrance chamber 16 in the shell 12, and the derivation|leading-out port 22 is the exit chamber 18 in the shell 12. ) is located adjacent to By disposing the introduction port 21 in the vicinity of the inlet chamber 16, the heat source medium with the largest amount of heat is introduced into the place with the lowest temperature, and freezing of water can be further suppressed. That is, when water flows into the inner space IS of the shell 12 through the introduction port 21, the water flows into the heat transfer tube 14 (heat transfer suppression member 30 to be described later) before changing the flow direction. It comes into contact with the end of the inlet chamber 16 side. For this reason, freezing at the edge part of the inlet chamber 16 side in the heat transfer tube 14 (heat transfer suppression member 30 mentioned later) can be suppressed further. Moreover, since the lead-out port 22 is arrange|positioned on the opposite side to the inlet chamber 16, in the shell 12, water flows easily along the heat exchanger tube 14, and heat exchange can be performed efficiently.

The heat transfer tube 14 has a shape extending in a straight line, and is disposed in the inner space IS of the shell 12 . And the heat transfer tube 14 is spanned between the inlet chamber 16 and the outlet chamber 18. As shown in FIG. That is, the partition wall 16b which partitions the inner space IS from the entrance chamber 16 is comprised as a tube plate which supports the one end of the heat exchanger tube 14. As shown in FIG. Moreover, the partition wall 18b which partitions the inner space IS from the exit chamber 18 is comprised as a pipe plate which supports the other end of the heat exchanger tube 14. As shown in FIG. The liquefied natural gas in the inlet chamber 16 flows into each heat transfer tube 14 . This liquefied natural gas vaporizes in the heat transfer tube 14 to become natural gas, and this natural gas joins in the outlet chamber 18 .

The heat transfer tube 14 is made of stainless steel, titanium, a titanium alloy, or steel.

The shell 12 is provided with a plurality of baffle plates 25 . The baffle plate 25 is provided in order to control the flow direction of the water flowing in the inner space IS. The baffle plates 25 are arranged at intervals in the longitudinal direction of the shell 12 . A gap is formed between the baffle plate 25 and the inner surface of the shell 12 in a direction orthogonal to the longitudinal direction. These gaps are located on opposite sides of the adjacent baffle plates 25 in the direction orthogonal to the longitudinal direction. The introduction port 21 is disposed between the partition wall 16b on the entrance chamber 16 side and the baffle plate 25 closest to the partition wall 16b. Moreover, the lead-out port 22 is arrange|positioned between the partition wall 18b on the side of the exit chamber 18 and the baffle plate 25 closest to this partition wall 18b. For this reason, in the inner space IS, the flow of the water meandering from the introduction port 21 to the lead-out port 22 arises.

The heat transfer tube 14 is provided with a heat transfer suppressing member 30 made of a material having a lower thermal conductivity than water. For this reason, the thermal conductivity of the heat transfer suppression member 30 is lower than the thermal conductivity of the raw material which comprises the heat transfer tube 14 . Since the heat transfer suppressing member 30 is attached only to a part of the long side direction of the heat transfer tube 14, a part of the heat transfer tube 14 is covered by the heat transfer suppressing member 30, but the other portion of the heat transfer tube 14 is It is not covered by the heat transfer suppression member 30, but is exposed.

In the heat transfer tube 14 , the portion covered by the heat transfer suppressing member 30 is the range from the portion where the low-temperature liquefied gas is introduced to the portion where the low-temperature liquefied gas starts to evaporate. That is, the portion where the heat transfer suppressing member 30 is provided is a partial portion of the heat transfer tube 14 including one end of the heat transfer tube 14 that is connected to the partition wall 16b on the inlet chamber 16 side. In other words, in the heat transfer tube 14, the site|part into which liquefied natural gas is introduce|transduced is contained in the site|part in which the heat transfer suppression member 30 is provided. And the range in which the heat transfer suppression member 30 is provided spans the range from the said one end to the middle part of the heat transfer tube 14. As shown in FIG. Since the site where liquefied natural gas starts to evaporate is affected by the pressure, flow rate, flow rate and temperature of liquefied natural gas, the range to which the heat transfer suppression member 30 is mounted is adjusted according to these pressures, flow rates, and temperature. do. In addition, the heat transfer suppression member 30 is not provided at the site downstream in the flow direction of liquefied natural gas from this site, that is, at the site where the natural gas after all the liquefied natural gas has evaporated is heated further, the heat transfer tube ( 14) is exposed. In addition, when the low-temperature liquefied gas flows through the heat transfer tube 14 in a supercritical fluid state, from the site where the low-temperature liquefied gas is introduced, to the site where the low-temperature liquefied gas is heated without a phase change in the low-temperature state. The heat transfer suppression member 30 is provided in the range.

The heat transfer suppression member 30 covers a predetermined range from the entrance chamber 16 . That is, the heat transfer suppression member 30 is disposed beyond the baffle plate 25 located closest to the inlet chamber 16 side from the end of the inlet chamber 16 side. That is, the baffle plate 25 is provided with a through hole through which the heat transfer tube 14 to which the heat transfer suppressing member 30 is mounted can be inserted, and the heat transfer suppressing member 30 passes through this through hole. A gap may be formed between the inner peripheral surface of the through hole in the baffle plate 25 and the outer peripheral surface of the heat transfer suppressing member 30 . In this way, the operation of inserting the heat transfer tube 14 into the through hole of the baffle plate 25 is not complicated.

The heat transfer suppression member 30 may be a film formed on the outer surface of the heat transfer tube 14 . That is, the heat transfer suppression member 30 may have a configuration formed on the outer surface of the heat transfer tube 14 by being installed on the heat transfer tube 14 . However, it is not limited to this. That is, the heat transfer suppressing member 30 may be provided on the heat transfer tube 14 by covering the independently formed member on the heat transfer tube 14 .

In the first embodiment, the heat transfer suppression member 30 is formed of a C-shaped member 32 in cross section in which a slit 32a extending over the entire long side direction is formed, as shown in FIGS. 2 and 3 . and is attached to the outside of the heat transfer tube 14 . That is, when the heat transfer suppressing member 30 is installed on the heat transfer tube 14, the slit 32a of the member 32 is opened, and the member 32 is attached to the heat transfer tube 14 from the outside in that state. . Accordingly, in the already installed vaporizer 10 , it is also possible to provide the heat transfer suppressing member 30 to the heat transfer tube 14 without disassembling the heat transfer tube 14 . In addition, the heat transfer suppression member 30 may not be the cross-section C-shaped member 32, but may be comprised by the pipe-shaped member.

In the state in which the heat transfer suppression member 30 is attached to the heat transfer tube 14, the slit 32a may be in the opened state, and the slit 32a may be in the closed state. There may be a case where water enters the inside of the heat transfer suppressing member 30 through the slit 32a. However, even if this water is frozen in some cases, ice does not grow to the outside of the heat transfer suppression member 30 .

In the present embodiment, the heat transfer suppressing member 30 is detachable from the heat transfer tube 14 . However, it is not limited to this, The heat transfer suppression member 30 may be adhere|attached to the heat transfer tube 14 with an adhesive agent etc.

The heat transfer suppressing member 30 may be formed of a resin-based material, a glass-based material, a rubber-based material, or a ceramic-based material as long as it is formed of a material having a lower thermal conductivity than water. Thereby, it can suppress that the cooling heat of liquid liquefied natural gas is transmitted to water through the heat transfer tube 14 .

Water (heat source medium) flows into the inner space IS of the shell 12 through the introduction port 21 . On the other hand, liquefied natural gas flows into the heat transfer tube 14 from the inlet chamber 16 . The liquefied natural gas flowing into the heat transfer tube 14 is heat-exchanged with water and gradually heated. However, since the heat transfer tube 14 in the vicinity of the inlet chamber 16 is covered with the heat transfer suppression member 30, heating of the liquefied natural gas is suppressed, and heat exchange with water is also suppressed. For this reason, cooling of the water existing around the heat transfer suppression member 30 is suppressed, and freezing of water is also suppressed.

Still, since the liquefied natural gas in the heat transfer tube 14 is heated little by little, the liquefied natural gas starts to evaporate in the heat transfer tube 14 covered with the heat transfer suppression member 30 . And after passing through the location covered with the heat transfer suppression member 30 in the heat transfer tube 14, the whole quantity of liquefied natural gas vaporizes, flowing through the heat transfer tube 14, and turns into gas (LNG). The gas flows into the outlet chamber 18 from the heat transfer tube 14, and then is sent to the facility on the user's side through an external pipe.

As explained above, in 1st Embodiment, while the site|part in which liquefied natural gas flows in a liquid state is covered with the heat transfer suppression member 30, the site|part from which liquefied natural gas starts to evaporate is also covered with the heat transfer suppression member 30 have. On the other hand, in sites other than these sites, the heat transfer tube 14 is not covered with the heat transfer suppression member 30 . That is, the site|part into which liquefied natural gas is introduce|transduced into the heat exchanger tube 14 is a site|part used as the lowest temperature in the heat exchanger tube 14. As shown in FIG. This part is covered by the heat transfer suppression member 30 formed of the material with a lower thermal conductivity than water. For this reason, since the cooling heat of the liquefied natural gas in the heat transfer tube 14 is transmitted to the water through the heat transfer tube 14 and the heat transfer suppression member 30, when the cold heat of the liquefied natural gas is directly transferred from the heat transfer tube 14 to water On the other hand, heat transfer to water can be suppressed. Accordingly, even when water does not flow in the vicinity of the outer surface of the heat transfer tube 14 , it is possible to suppress freezing of water around the heat transfer tube 14 . Moreover, in the site|part from which liquefied natural gas starts to evaporate, liquefied natural gas is easy to absorb heat from the heat exchanger tube 14. As shown in FIG. However, since this part is also covered with the heat transfer suppression member 30, the heat transfer tube 14 is suppressed from absorbing heat from surrounding water. Accordingly, even when water does not flow in the vicinity of the outer surface of the heat transfer tube 14 , it is possible to suppress freezing of water around the heat transfer tube 14 .

Further, in the first embodiment, since the heat transfer suppressing member 30 is constituted by the C-shaped member 32 in cross section, the heat transfer suppressing member 30 is externally connected to the heat transfer tube 14 by opening the portion of the slit 32a. can be installed Accordingly, it is possible to prevent the installation operation of the heat transfer suppressing member 30 from becoming cumbersome.

In addition, although the example in which the heat transfer suppression member 30 was formed by the cross-sectional C-shaped member 32 was shown in 1st Embodiment, it is not limited to this. For example, as shown in FIG. 4 , the heat transfer suppression member 30 may be formed of the tubular member 34 . In this case, in order to install the tubular member 34 to the heat transfer tube 14, it is sufficient that the heat transfer tube 14 is mounted at one end of the heat transfer tube 14 before being placed between the partition walls 16b and 18b. In this configuration, since a part of the heat transfer tube 14 in the circumferential direction is not cut off, it is possible to prevent water from entering the inside of the heat transfer suppressing member 30 .

In addition, as shown in FIG. 5, the heat transfer suppression member 30 may be comprised by the two halving-shaped member 35 which has a semicircular arc-shaped cross section. In this case, it is also possible to provide the heat transfer suppression member 30 from the back to the heat transfer tube 14 of the already installed vaporizer 10 . In addition, the halving member 35 may be adhere|attached to the heat exchanger tube 14 with an adhesive agent, or may be fixed to the heat exchanger tube 14 by hooking and winding a belt member (not shown).

In addition, when the heat transfer suppression member 30 is constituted by the cross-sectional C-shaped member 32 , as shown in FIG. 6 , even if the second heat transfer suppression member 37 is provided outside the heat transfer suppression member 30 , do. The second heat transfer suppressing member 37 is made of a material having a lower thermal conductivity than water. For this reason, the 2nd heat transfer suppression member 37 may be comprised with the same material as the heat transfer suppression member 30 . In this case, the thickness of the heat transfer suppression member 30 shown in FIG. 6 can be set to about half the thickness of the heat transfer suppression member 30 shown in FIGS. 2 and 3 .

The second heat transfer suppressing member 37 has an inner diameter slightly smaller than the outer diameter of the heat transfer suppressing member 30 or has an inner diameter equal to the outer diameter of the heat transfer suppressing member 30, and has a slit 37a over the entire long side direction. It is composed of the formed cross-sectional C-shaped member. The slit 37a of the second heat transfer suppressing member 37 is shifted in the circumferential direction with respect to the slit 32a of the heat transfer suppressing member 30 . For this reason, the slit 32a of the heat transfer suppression member 30 is covered with the 2nd heat transfer suppression member 37. As shown in FIG.

When the 2nd heat transfer suppression member 37 is provided, penetration of water from the slit 32a can be suppressed. That is, it is possible to achieve both the facilitation of the attaching operation of the heat transfer suppressing member 30 and the effect of preventing the intrusion of water.

The heat transfer suppression member 30 may be comprised by the some division member 39 arranged in the direction in which the heat transfer tube 14 extends, as shown in FIG. That is, the plurality of division members 39 are disposed on the heat transfer tube 14 , so that the heat transfer suppressing member 30 is attached to the heat transfer tube 14 . In this case, the second heat transfer suppressing member 41 is provided so as to cover between the adjacent dividing members 39 . The second heat transfer suppressing member 41 is made of a material having a lower thermal conductivity than water. For this reason, the 2nd heat transfer suppression member 41 may be comprised with the same material as the heat transfer suppression member 30 . A plurality of second heat transfer suppressing members 41 are also disposed. And the contact position of adjacent division|segmentation member 39 comrades and the contact position of the adjacent 2nd heat transfer suppression member 41 shift|deviate from it. For this reason, even if a clearance gap is formed between adjacent division|segmentation members 39 comrades, the clearance gap is covered with the 2nd heat transfer suppression member 41. As shown in FIG.

In this aspect, by arranging the plurality of division members 39 in the direction in which the heat transfer tube 14 extends, the heat transfer suppressing member 30 can be attached to the heat transfer tube 14 . For this reason, even when the heat transfer tube 14 has a very long configuration, it is unnecessary to prepare the heat transfer suppressing member 30 of a very long integral body, so that the installation operation of the heat transfer suppressing member 30 can be suppressed from becoming complicated. have. In addition, since the second heat transfer suppressing member 41 covers the gap between the dividing members 39, it is possible to suppress the penetration of water through the gap.

Further, as shown in FIG. 8 , one end of the adjacent dividing member 39 may cover the end of the other dividing member 39 . In this case, even if it does not provide the 2nd heat transfer suppression member 37, the clearance gap between the ends of the division|segmentation member 39 can be covered.

Although the structure in which the water introduction port 21 was provided only on the inlet chamber 16 side in the shell 12 was shown in the structure of FIG. 1, it is not limited to this. As shown in FIG. 9 , the water introduction port 21 may be provided on the inlet chamber 16 side and the outlet chamber 18 side. In this case, the water lead-out port 22 is disposed at a central position in the longitudinal direction of the shell 12 . Also in this case, the heat transfer suppression member 30 is provided only in a part of the inlet chamber 16 side in the heat transfer tube 14 . In addition, the baffle plate 25 may be provided, and may be abbreviate|omitted as shown in FIG.

In the structure of FIG. 1, although the structure which the heat transfer tube 14 was comprised by the straight tube was shown, it is not limited to this. As shown in FIG. 10 , the heat transfer tube 14 may be constituted by a U-shaped tube. In this case, the inlet chamber 16 and the outlet chamber 18 are arranged so as to be adjacent to each other on one end side of the shell 12 in the longitudinal direction. The exit chamber 18 is arrange|positioned above the entrance chamber 16, for example. And liquefied natural gas flows in from the inlet chamber 16 into the lower straight pipe part 14a in a U-pipe. For this reason, the heat transfer suppression member 30 is provided in the lower straight pipe part 14a in a U-pipe. Since a part of liquefied natural gas begins to evaporate in the lower straight pipe part 14a in the U-pipe, the heat transfer suppression member 30 is arranged to the intermediate position of the lower straight pipe part 14a. .

As shown in FIG. 11 , in the vaporizer 10 , in addition to the heat transfer tube 14 (evaporation unit) in which the liquefied natural gas evaporates, a natural gas warming unit 43 may be provided in the shell 12 . In this case, a communication tube 45 is connected to the outlet chamber 18 , and the communication tube 45 is connected to a connection chamber 47 communicating with a heat transfer tube constituting the heating unit 43 . The natural gas flowing through the communication tube 45 flows into the heating unit 43 (heat transfer tube) through the connection chamber 47 , and is further heated in the heating unit 43 . The natural gas flowing through the heating unit 43 flows out through the supply chamber 49 to an external pipe (not shown).

In the configuration of FIG. 1 , the configuration in which the heat transfer tube 14 is formed of straight tubes is illustrated. Alternatively, the heat transfer tube 14 may be formed to meander as illustrated in FIG. 12 . That is, the heat transfer tube 14 has a plurality of straight tube portions 14b arranged at intervals up and down, and a plurality of curved bent portions 14c arranged at the ends of the straight tube portion 14b, and is meandering up and down while meandering. It may have a shape extending to . And the lowermost straight pipe part 14b connects to the entrance chamber 16, and the uppermost straight pipe part 14b connects to the outlet chamber 18. As shown in FIG.

In this case, the liquefied natural gas is introduced from the inlet chamber 16 into the straight pipe part 14b located at the lowermost side among the plurality of straight pipe parts 14b, and a part of the straight pipe part 14b starts to evaporate. do. For this reason, the heat transfer suppression member 30 is attached to the lowermost straight pipe part 14b. In addition, it is not necessary that the heat transfer suppression member 30 is attached to the lowermost bend part 14c. This is because in the bend portion 14c, even if icing occurs, the gap between the adjacent heat transfer tubes 14 is not blocked.

When the heat transfer tube 14 is formed so as to meander, for example, as shown in FIGS. 13 and 14 (a), a plurality of bend portions ( 14c) may be alternately displaced. The same applies to the other end. Specifically, in the plurality of bend portions 14c of the heat transfer tube 14, a first bend portion 71, which is a bend portion on the side protruding in the extension protrusion direction of the straight tube portion 14b, and the extension protrusion of the straight tube portion 14b A second bend portion 72, which is a bend portion on the retracted side in the direction, is included. And the 1st bend part 71 and the 2nd bend part 72 are arrange|positioned alternately in the up-down direction. In addition, at least one of the first bend portion 71 and the second bend portion 72 may be included, respectively.

The first bend portion 71 and the second bend portion 72 are welded to the ends of the straight pipe portion 14b. The welding part 71a of the 1st bend part 71 and the straight pipe part 14b is the welding part 72a of the 2nd bend part 72 and the straight pipe part 14b in the extension and protrusion direction of the straight pipe part 14b. It is located more on the apex part 72c side of the 2nd bend part 72 (the right side in FIGS. 13 and 14(a)). In addition, the welding part 71a of the 1st bend part 71 and the straight pipe part 14b WHEREIN: The inner curved part 72b of the 2nd bend part 72 WHEREIN: You may be located on the apex part 72c side of the 2 bend part 72. In addition, the welding portion 71a of the first bent portion 71 and the straight pipe portion 14b is farther outside than the apex portion 72c of the second bent portion 72 in the extending protrusion direction of the straight pipe portion 14b. You may be located (the side separated from the inner curved-surface part 72b, the right side in FIGS. 13 and 14(a)). Alternatively, the welding portion 71a of the first bend portion 71 and the straight tube portion 14b is the apex portion 72c of the second bend portion 72 in the extending projection direction of the straight tube portion 14b. and the welding part 72a may be located.

One end of the heat transfer tube 14 may be connected to the inlet chamber 16. Instead, as shown in FIG. 13 , it is connected to an inflow header 75 for introducing liquefied natural gas into the plurality of heat transfer tubes 14 . it may be The inlet header 75 is disposed within the shell 12 and is connected to an inlet pipe 76 passing through the shell 12 . Liquefied natural gas flows into the inlet header 75 from the outside of the shell 12 through the inlet pipe 76 . The heat transfer suppression member 30 is attached to the lowermost straight pipe portion 14b connected to the inflow header 75 .

The other end of the heat transfer tube 14 may be connected to the outlet chamber 18 , but instead of this, it may be connected to an outflow header 77 in which the natural gas obtained by the plurality of heat transfer tubes 14 is joined. An outlet header 77 is disposed within the shell 12 and is connected to an outlet conduit 78 passing through the shell 12 . The natural gas in the outlet header 77 is led out of the shell 12 through an outlet conduit 78 . As shown in FIG. 13 , the baffle plate 25 may be coupled to one side of the shell 12 by a spacer 79 and a tie rod 80 .

As shown in Figs. 14(a) and 14(b), the plurality of heat transfer tubes 14 arranged in the horizontal direction are arranged so that the bend portions 14c are alternately shifted in a positional relationship. Specifically, the first heat pipe 61, the second heat pipe 62 adjacent to the first heat pipe 61, the third heat pipe 63 adjacent to the second heat pipe 62, and the third heat pipe 63 ) adjacent to the fourth heat transfer tube 64 will be described. In the first heat transfer tube 61 and the third heat transfer tube 63, the bent portion 14c at a certain height is in a protruding position in the extending and protruding direction of the straight tube portion 14b, and the second heat transfer tube 62 and the second heat transfer tube In the 4 heat transfer tubes 64 , the bent portions 14c at the same height are at the positions retracted in the extending and projecting direction of the straight tube portions 14b. Accordingly, when viewed in the horizontal direction, the heat transfer tubes 14 in which the bent portions 14c protrude and the heat transfer tubes 14 in which the bent portions 14c are retracted are alternately arranged. For example, the bend portion 14c (adjacent first bend portion) of the second heat transfer tube 62 (adjacent heat transfer tube) positioned next to the first bend portion 71 of the first heat transfer tube 61 is retracted. The second bend portion 72 is disposed at the position. In addition, the bend portion 14c (adjacent second bend portion) of the second heat transfer tube 62 positioned next to the second bend portion 72 of the first heat transfer tube 61 includes a first bent portion disposed at a protruding position. a bend portion 71 . These relationships are the same between the second heat transfer tube 62 and the third heat transfer tube 63 , and also between the third heat transfer tube 63 and the fourth heat transfer tube 64 . In addition, since the second heat transfer tube 62 is disposed adjacent to the first heat transfer tube 61 , it can be said that the second heat transfer tube 62 is adjacent to the first heat transfer tube 61 . On the other hand, since the first heat transfer tube 61 is disposed adjacent to the second heat transfer tube 62 , it can be said that the first heat transfer tube 61 is adjacent to the second heat transfer tube 62 .

The second bend portions 72 of the first heat transfer tube 61 are respectively disposed above and below the first bend portion 71 of the first heat transfer tube 61 . Next to the second bend portion 72, the first bend portion 71 (adjacent second bend portion) of the second heat transfer tube 62 is arranged, respectively. That is, in both the vertical direction and the horizontal direction, the protruding bend portion 14c (first bend portion 71) and the retracted bend portion 14c (second bend portion 72) are alternately arranged. is arranged. In addition, although the bend part 14c is comprised by the short radial bend, it may be comprised by the long radial bend.

The welded portion 71a of the first bend portion 71 and the straight tube portion 14b in the first heat transfer tube 61 is adjacent to the first bend portion (second bend portion 72) in the second heat transfer tube 62 . )) and the apex portion 72c side of the first bend portion adjacent to the welding portion 72a of the straight tube portion 14b in the extending protrusion direction of the straight tube portion 14b (Fig. 14(a), (b) to the right of), and is placed in a protruding position. In addition, the welded portion 71a of the first bend portion 71 in the first heat transfer tube 61 is inside the adjacent first bent portion (second bend portion 72) in the second heat transfer tube 62 . It is arrange|positioned at the position which protruded toward the apex part 72c side of the said adjacent 1st bend part in the extension and protrusion direction of the straight pipe part 14b rather than the curved surface part 72b. The welded portion 71a of the first bend portion 71 in the first heat transfer tube 61 is adjacent to the first bend in the second heat transfer tube 62 in the extending and protruding direction of the straight tube portion 14b. It is arrange|positioned at the position corresponding to the position of the apex part 72c of a part (2nd bend part 72). In addition, the welded portion 71a of the first bend portion 71 in the first heat transfer tube 61 is the second bent portion in the second heat transfer tube 62 in the extending and protruding direction of the straight tube portion 14b. It may be disposed between the inner curved portion 72b of 72 and the apex portion 72c of the bend portion 72, or more outer (inner curved surface) than the apex portion 72c of the bent portion 72 . You may be located on the side separated from the part 72b, the right side of FIG. 14(a)).

In any of the heat transfer tubes 61 to 64 arranged in the horizontal direction, the welded portion (first tube welded portion) 71a of the first bent portion 71 is the welded portion of the second bent portion 72 of the adjacent heat transfer tube. It protrudes from (2nd pipe welding part) in the extension protrusion direction of the straight pipe part 14b. For example, since the adjacent second bend portion in the second heat transfer tube 62 serves as the first bend portion 71, the welding portion 71a between the adjacent second bend portion and the straight pipe portion 14b is a second bend. It is arrange|positioned at the position which protruded in the extension and protrusion direction of the straight pipe part 14b rather than the welding part 72a of the adjacent 1st bend part and the straight pipe part 14b which are the parts 72. As shown in FIG.

In any of the first heat transfer tubes (61) to (64), the heat transfer suppression member (30) is attached to the lowermost straight tube portion (14b).

(Second embodiment)

Although 1st Embodiment is the vaporizer 10 of liquefied natural gas, 2nd Embodiment is the cooling system 53 provided with the vaporizer 10. As shown in FIG. Specifically, as shown in FIG. 15 , the cooling system 53 includes a vaporizer 10 and a cooler 55 . The vaporizer 10 is the vaporizer 10 of any structure demonstrated in 1st Embodiment. The cooler 55 is connected to the lead-out port 22 of the vaporizer 10 via a pipe 56 . The cooler 55 is constituted by a heat exchanger that cools a predetermined object with water cooled by liquefied natural gas. The object to be cooled by the cooler 55 can be selected according to the purpose, such as air conditioning air or cold water used for indoor cooling, vegetable factory, cable pit cooling, etc., and intake air of a gas turbine.

In the cooling system 53 , the water cooled by the liquefied natural gas in the vaporizer 10 is used in the cooler 55 to cool the cooling target. Therefore, the cooling heat of liquefied natural gas can be utilized for cooling of a cooling object. Moreover, by providing the heat transfer suppression member 30 in the vaporizer 10, freezing of water is aimed at. For this reason, it becomes possible to set the vaporizer 10 so that the temperature of the water derived|led-out from the inside of vaporizer 10 may become lower. Therefore, the ability as the cooling system 53 can be improved.

In addition, although the description is abbreviate|omitted for another structure, an action|action, and an effect, the description of the said 1st Embodiment can be invoked for 2nd Embodiment.

10: carburetor
12: shell
14: heat pipe
14a: straight pipe
14b: straight pipe
14c: bend part
16: entrance room
18: exit room
30: heat transfer suppression member
32: slit
37: second heat transfer suppression member
39: split member
41: second heat transfer suppression member

Claims (16)

a shell having an inner space and into which water is introduced into the inner space through an introduction port;
a heat transfer tube disposed in the inner space and into which a low-temperature liquefied gas is introduced to heat the low-temperature liquefied gas with the water;
Provided with a heat transfer suppression member formed of a material having a lower thermal conductivity than water,
the heat transfer suppressing member covers the heat transfer tube in a part of the heat transfer tube including the introduction site of the low-temperature liquefied gas;
The low-temperature liquefied gas vaporizer, wherein the introduction port is provided on a side of the introduction site of the low-temperature liquefied gas in the cell. According to claim 1,
The heat transfer suppressing member covers the heat transfer tube from the introduction portion of the low-temperature liquefied gas to a portion where the low-temperature liquefied gas is heated without a phase change or a portion where the low-temperature liquefied gas starts to evaporate, Low temperature liquefied gas vaporizer. 3. The method of claim 1 or 2,
The low-temperature liquefied gas vaporizer, wherein the heat transfer suppression member is formed of a resin-based material, a glass-based material, a rubber-based material, or a ceramic-based material. 3. The method of claim 1 or 2,
The low-temperature liquefied gas vaporizer, wherein the heat transfer suppression member is constituted by a C-shaped cross-section member, a pipe-like member, or two halved members. 3. The method of claim 1 or 2,
The low-temperature liquefied gas vaporizer, wherein the heat transfer suppressing member is provided in the heat transfer tube from the outside so that it is detachably attached to the heat transfer tube. 3. The method of claim 1 or 2,
The heat transfer suppression member is constituted by a C-shaped cross-section member having a slit,
A low-temperature liquefied gas vaporizer with a second heat transfer suppressing member covering the slit of the heat transfer suppressing member. 3. The method of claim 1 or 2,
The heat transfer suppression member is constituted by a plurality of division members arranged in a direction in which the heat transfer tube extends,
A low-temperature liquefied gas vaporizer, which is formed of a material having a lower thermal conductivity than water and is provided with a second heat transfer suppressing member covering between the dividing members. 3. The method of claim 1 or 2,
The heat transfer suppression member is constituted by a plurality of division members arranged in a direction in which the heat transfer tube extends,
A low-temperature liquefied gas vaporizer, wherein one end of the adjacent dividing member covers the end of the other dividing member. 3. The method of claim 1 or 2,
The heat transfer tube has a plurality of straight tube portions and a plurality of bend portions, and has a shape extending up and down while meandering,
The low-temperature liquefied gas is introduced into the lowermost straight pipe part among the plurality of straight pipe parts,
The low-temperature liquefied gas vaporizer, in which the said heat transfer suppression member is attached to the straight pipe part located in the said lowermost position. 10. The method of claim 9,
At least one first bend portion and at least one second bend at a position retracted from the first bend portion in the extension and protrusion direction of the straight pipe portion than the first bend portion, in the plurality of bend portions arranged in the vertical direction among the plurality of bend portions part is included, wherein the at least one first bend part and the at least one second bend part are alternately arranged,
A low-temperature liquefied gas vaporizer, wherein the welding portion of the at least one first bent portion and the straight tube portion protrudes more than the welding portion of the at least one second bent portion and the straight tube portion in an extension protruding direction of the straight tube portion. 11. The method of claim 10,
an adjacent heat transfer tube disposed adjacent to the heat transfer tube in the inner space and into which a low-temperature liquefied gas is introduced to heat the low-temperature liquefied gas with the water;
The adjacent heat transfer tube has a plurality of straight tube portions and a plurality of bend portions, and has a shape extending up and down while meandering,
In the plurality of bend portions arranged in the vertical direction among the plurality of bend portions in the adjacent heat transfer tube, at least one adjacent first bend portion adjacent to the at least one first bend portion, and the at least one second bend portion at least one adjacent second bend portion adjacent to the bend portion is included, wherein the at least one adjacent first bend portion and the at least one adjacent second bend portion are alternately arranged,
A welding portion of the at least one adjacent second bent portion and the straight pipe portion protrudes from a welding portion of the at least one adjacent first bent portion and the straight pipe portion in an extension protruding direction of the straight pipe portion, and the at least one second bent portion and the low-temperature liquefied gas vaporizer which protrudes from the said welding part of the straight pipe part in the extension and protrusion direction of the said straight pipe part. 3. The method of claim 1 or 2,
an inlet chamber into which the low-temperature liquefied gas flows;
and an outlet chamber into which the gas vaporized from the low-temperature liquefied gas in the heat transfer tube flows;
The heat transfer tube is constituted by a straight pipe connecting the inlet chamber and the outlet chamber in a straight line,
The low-temperature liquefied gas vaporizer, wherein the heat transfer suppressing member covers a predetermined range from the inlet chamber in the heat transfer tube. 3. The method of claim 1 or 2,
The heat transfer tube is constituted by a U-shaped tube,
The low-temperature liquefied gas is introduced into the lower straight pipe part of the U-tube,
The low-temperature liquefied gas vaporizer, wherein the heat transfer suppression member covers the lower straight pipe part of the U-tube. 3. The method of claim 1 or 2,
an inlet chamber into which the low-temperature liquefied gas flows;
an outlet chamber into which the gas vaporized from the low-temperature liquefied gas in the heat transfer tube flows;
and an introduction port for introducing the water into the inner space of the shell;
The low-temperature liquefied gas vaporizer, wherein the introduction port is disposed at a position adjacent to the inlet chamber in the shell. The vaporizer according to claim 1 or 2,
and a cooler into which water cooled by the low-temperature liquefied gas is introduced in the vaporizer. a shell having an inner space and into which water is introduced into the inner space through an introduction port;
A method for suppressing icing in a vaporizer provided with a heat transfer tube disposed in the inner space, a low-temperature liquefied gas is introduced, and the low-temperature liquefied gas is heated with the water,
A heat transfer suppressing member formed of a material having a lower thermal conductivity than water is provided on the outer surface of a part of the heat transfer tube including a site for introducing the low-temperature liquefied gas in the heat transfer tube,
The method for suppressing icing in a vaporizer, wherein the introduction port is provided on a side of an introduction site of the low-temperature liquefied gas in the cell.

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